/*
* This file is part of JOP, the Java Optimized Processor
* see <http://www.jopdesign.com/>
*
* Copyright (C) 2011, Stefan Hepp (stefan@stefant.org).
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.jopdesign.jcopter.greedy;
import com.jopdesign.jcopter.analysis.AnalysisManager;
import com.jopdesign.jcopter.analysis.ExecFrequencyProvider;
/**
* @author Stefan Hepp (stefan@stefant.org)
*/
public class GainCalculator {
private final AnalysisManager analyses;
public GainCalculator(AnalysisManager analyses) {
this.analyses = analyses;
}
public long calculateGain(ExecFrequencyProvider ecp, Candidate candidate) {
long gain = ecp.getExecCount(candidate.getMethod(), candidate.getEntry())
* candidate.getLocalGain();
gain -= candidate.getDeltaCacheMissCosts(analyses, ecp);
gain -= getCodesizeCacheCosts(ecp, candidate);
return gain;
}
public long improveGain(ExecFrequencyProvider ecp, Candidate candidate, long gain) {
// TODO depending on config, use WCA to calculate local or global WC gain
// TODO else add heuristic factor to prefer candidates outside IF-constructs
return (long) (candidate.getHeuristicFactor() * gain);
}
private long getCodesizeCacheCosts(ExecFrequencyProvider ecp, Candidate candidate) {
return analyses.getMethodCacheAnalysis().getDeltaCacheMissCosts(ecp, candidate);
}
}